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Monaco, Lopez advance to US Men's Clay Court semfinals

  • Juan Monaco of Argentina returns a shot against Sam Querrey of the United States in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)

    Juan Monaco of Argentina returns a shot against Sam Querrey of the United States in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)  (The Associated Press)

  • Juan Monaco of Argentina returns a shot against Sam Querrey of the United States in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)

    Juan Monaco of Argentina returns a shot against Sam Querrey of the United States in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)  (The Associated Press)

  • Sam Querrey of the United States screams after missing a chance to break the serve of Juan Monaco of Argentina in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)

    Sam Querrey of the United States screams after missing a chance to break the serve of Juan Monaco of Argentina in the quarterfinals of the U.S. men's clay court championships tennis tournament Friday, April 8, 2016, in Houston. Monaco won 6-4, 6-4. (AP Photo/Pat Sullivan)  (The Associated Press)

Argentina's Juan Monaco beat fifth-seeded Sam Querrey 6-4, 6-4 of the United States on Friday in the U.S. Men's Clay Court Championship quarterfinals.

The 32-year-old Monaco won the event at River Oaks in 2012. He will face third-seeded Feliciano Lopez of Spain, a 6-2, 6-3 winner over American Tim Smyczek.

In the night quarterfinals, top-seeded John Isner of the United States faced South Korea's Chung Hyeon, and fourth-seeded defending champion Jack Sock played seventh-seeded Marcos Baghdatis of Cyprus.